The Photoelectric Effect and Wave-Particle Duality (6.1) | General Chemistry

Описание: Nature of Light
Chad provides a comprehensive lesson on the nature of light and the Photoelectric Effect. Light is described as having Wave-Particle Duality in which it exhibits both wave-like and particle-like behavior. In having wave-like properties light has both a wavelength and a frequency and the mathematical relationship between them is presented. In exhibiting particle-like behavior light comes in discrete packets of energy (i.e. quanta) that are referred to as photons and the relationship between the energy of a photon to its frequency and wavelength is presented.

Electromagnetic Spectrum
The divisions of the electromagnetic spectrum are also presented in terms of energy, frequency, and wavelength including gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves.

Photoelectric Effect
The lesson is concluded with a presentation of the Photoelectric Effect in which electrons are ejected from a metal upon irradiation with light. A minimum threshold energy for these photons is required, referred to as the work function of a metal, and photons of energy greater than this amount result in greater kinetic energy for the ejected electrons.

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00:00 Lesson Introduction
00:56 Wave Nature of Light
05:40 The Electromagnetic Spectrum
11:20 Calculating Wavelength, Frequency, & Energy of Photons
18:43 The Photoelectric Effect

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